HD6417615 Hitachi Semiconductor, HD6417615 Datasheet - Page 68

• Manufacturer Part Number: HD6417615
• Description: Hardware Manual
• Manufacturer: Hitachi Semiconductor

T Bit: The T bit in the status register (SR) changes according to the result of a comparison, and
conditional branches occur in accordance with its true or false status. The number of instructions
modifying the T bit is kept to a minimum to improve the processing speed.
Table 2.8
SH7615 CPU
CMP/GE
BT
BF
ADD
CMP/EQ
BT
Immediate Data: Byte immediate data resides in instruction code. Word or longword immediate
data is not input in instruction codes but is stored in a memory table. An immediate data transfer
instruction (MOV) accesses the memory table using the PC relative addressing mode with
displacement.
Table 2.9
Classification
8-bit immediate
16-bit immediate
32-bit immediate
Note: @(disp, PC) accesses the immediate data.
50
R1,R0
TRGET0
TRGET1
#–1,R0
#0,R0
TRGET
T Bit
Immediate Data Accessing
SH7615 CPU
MOV
MOV.W
........
.DATA.W H'1234
MOV.L
........
.DATA.L H'12345678
Description
T bit is set when R0
The program branches to TRGET0
when R0
The program branches to TRGET1
when R0 < R1
T bit is not changed by ADD. T bit
is set when R0 = 0. The program
branches when R0 = 0
#H'12,R0
@(disp,PC),R0
@(disp,PC),R0
R1.
R1.
Example of Conventional CPU
MOV.B
MOV.W
MOV.L
Example of Conventional CPU
CMP.W R1,R0
BGE
BLT
SUB.W #1,R0
BEQ
#H'12,R0
#H'1234,R0
#H'12345678,R0
TRGET0
TRGET1
TRGET